Piezo-Electric Rocks

Piezoelectricity is the ability of certain crystals to produce a voltage when subjected to mechanical stress. The word is derived from the Greek piezein, which means to squeeze or press. These two quartz rocks have piezo-electric properties--simply put a rock in each hand and rub them together in a dark room to see light and sparks.  Excellent for demonstration purposes in a classroom setting.

Features:

• 2 quartz rocks with piezoelectric properties
• Spark and glow in the dark when rubbed against each other
• Rocks range from 1 - 4 inches in length
• Great for science projects or stocking stuffers